Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/eb3375b96956
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #14350 from snowmantw/issue946139

Bug 946139 - [LockScreen] Make lockscreen unlocking strategy customizable

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https://hg.mozilla.org/integration/gaia-central/rev/bbc0e5695321
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 946139 - [LockScreen] Make lockscreen unlocking strategy customizable.